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<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">Hi All,<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">I read below doc about pmd assignment for physical port. I think the limitation “on the same NUMA node” may be not efficient.
<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal" style="margin-left:52.5pt;mso-para-margin-left:5.0gd"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><a href="http://docs.openvswitch.org/en/latest/intro/install/dpdk/"><span style="mso-bidi-font-size:11.0pt">http://docs.openvswitch.org/en/latest/intro/install/dpdk/</span></a></span><span lang="EN-US"><o:p></o:p></span></font></p>
<h3 style="margin-left:52.5pt;mso-para-margin-left:5.0gd"><b><font size="4" color="black" face="Arial"><span lang="EN-US" style="font-size:13.5pt;font-family:"Arial","sans-serif";color:black">DPDK Physical Port Rx Queues<a href="http://docs.openvswitch.org/en/latest/intro/install/dpdk/#dpdk-physical-port-rx-queues" title="Permalink to this headline">¶</a><o:p></o:p></span></font></b></h3>
<pre style="margin-left:52.5pt;mso-para-margin-left:5.0gd;background:#F0F0F0;vertical-align:top;overflow:auto"><font size="3" color="black" face="宋体"><span lang="EN-US" style="font-size:12.0pt;color:black">$ ovs-vsctl set Interface <DPDK interface> options:n_rxq=<integer><o:p></o:p></span></font></pre>
<p style="margin-left:52.5pt;mso-para-margin-left:5.0gd;vertical-align:baseline;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;word-spacing:0px">
<font size="2" color="black" face="Arial"><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">The above command sets the number of rx queues for DPDK physical interface. The rx queues are assigned to pmd threads
</span></font><font size="2" color="red" face="Arial"><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif";color:red">on the same NUMA node</span></font><font size="2" color="black" face="Arial"><span lang="EN-US" style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">
in a round-robin fashion.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">Consider below case:<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">One host has one PCI NIC on NUMA node 0, and has 4 VMs, which spread in NUMA node 0 and 1. There are multiple rx queues configured
on the physical NIC. We configured 4 pmd (two cpu from NUMA node0, and two cpu from node 1). Since the physical NIC locates on NUMA node0, only pmds on same NUMA node can poll its rxq. As a result, only two cpu can be used for polling physical NIC.<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">If we compare the OVS kernel mode, there is no such limitation.<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">So question:<o:p></o:p></span></span></font></p>
<p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">should we remove “same NUMA node” limitation fro physical port rx queues?
Or we have other options to improve the performance for this case?<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">Br,<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US" style="font-size:10.5pt"><span style="mso-bidi-font-size:11.0pt">Wang Zhike<o:p></o:p></span></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri"><span lang="EN-US"><o:p> </o:p></span></font></p>
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